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// File GccAna_Circ2d3Tan.cxx, REG 08/07/91
#include <GccAna_Circ2d3Tan.jxx>
#include <ElCLib.hxx>
#include <IntAna2d_AnaIntersection.hxx>
#include <IntAna2d_IntPoint.hxx>
#include <gp_Lin2d.hxx>
#include <gp_Circ2d.hxx>
#include <gp_Dir2d.hxx>
#include <GccAna_LinPnt2dBisec.hxx>
#include <GccAna_Lin2dBisec.hxx>
#include <GccAna_Pnt2dBisec.hxx>
#include <GccInt_Bisec.hxx>
#include <GccInt_IType.hxx>
#include <IntAna2d_Conic.hxx>
#include <GccEnt_BadQualifier.hxx>
#include <Precision.hxx>
//=========================================================================
// Creation d un cercle tangent a une droite et a deux points. +
//=========================================================================
GccAna_Circ2d3Tan::
GccAna_Circ2d3Tan (const GccEnt_QualifiedLin& Qualified1,
const gp_Pnt2d& Point2 ,
const gp_Pnt2d& Point3 ,
const Standard_Real Tolerance ):
cirsol(1,2) ,
qualifier1(1,2) ,
qualifier2(1,2) ,
qualifier3(1,2) ,
TheSame1(1,2) ,
TheSame2(1,2) ,
TheSame3(1,2) ,
pnttg1sol(1,2) ,
pnttg2sol(1,2) ,
pnttg3sol(1,2) ,
par1sol(1,2) ,
par2sol(1,2) ,
par3sol(1,2) ,
pararg1(1,2) ,
pararg2(1,2) ,
pararg3(1,2)
{
WellDone = Standard_False;
Standard_Real Tol = Abs(Tolerance);
gp_Dir2d dirx(1.0,0.0);
NbrSol = 0;
if (!(Qualified1.IsEnclosed() ||
Qualified1.IsOutside() || Qualified1.IsUnqualified())) {
GccEnt_BadQualifier::Raise();
return;
}
//=========================================================================
// Traitement. +
//=========================================================================
gp_Lin2d L1 = Qualified1.Qualified();
gp_Pnt2d origin1(L1.Location());
gp_Dir2d dir1(L1.Direction());
gp_Dir2d normL1(-dir1.Y(),dir1.X());
if (Point2.IsEqual(Point3,Precision::Confusion())) {
WellDone = Standard_False;
return ;
}
GccAna_Pnt2dBisec Bis1(Point2,Point3);
GccAna_LinPnt2dBisec Bis2(L1,Point2);
if (Bis1.IsDone() && Bis2.IsDone()) {
gp_Lin2d linint1(Bis1.ThisSolution());
Handle(GccInt_Bisec) Sol2 = Bis2.ThisSolution();
GccInt_IType typ2 = Sol2->ArcType();
#ifdef DEB
gp_Lin2d linintb(Bis1.ThisSolution());
#else
Bis1.ThisSolution() ;
#endif
IntAna2d_AnaIntersection Intp;
if (typ2 == GccInt_Lin) {
gp_Lin2d linint2(Sol2->Line());
Intp.Perform (linint1,linint2);
}
else if (typ2 == GccInt_Par) {
Intp.Perform (linint1,IntAna2d_Conic(Sol2->Parabola()));
}
if (Intp.IsDone()) {
if ((!Intp.IsEmpty())&&(!Intp.ParallelElements())&&
(!Intp.IdenticalElements())) {
for (Standard_Integer j = 1 ; j <= Intp.NbPoints() ; j++) {
gp_Pnt2d Center(Intp.Point(j).Value());
Standard_Real dist1 = L1.Distance(Center);
Standard_Real dist2 = Center.Distance(Point2);
Standard_Real Radius=0;
// Standard_Integer nbsol2 = 0;
Standard_Integer nbsol3 = 0;
Standard_Boolean ok = Standard_False;
if (Qualified1.IsEnclosed()) {
if ((((origin1.X()-Center.X())*(-dir1.Y()))+
((origin1.Y()-Center.Y())*(dir1.X())))<=0){
ok = Standard_True;
Radius = dist1;
}
}
else if (Qualified1.IsOutside()) {
if ((((origin1.X()-Center.X())*(-dir1.Y()))+
((origin1.Y()-Center.Y())*(dir1.X())))>=0){
ok = Standard_True;
Radius = dist1;
}
}
else if (Qualified1.IsUnqualified()) {
ok = Standard_True;
Radius = dist1;
}
if (ok) {
if (Abs(dist2-Radius)<=Tol && Abs(dist2-Radius)<=Tol) {
nbsol3 = 1;
}
else { ok = Standard_False; }
}
if (ok) {
for (Standard_Integer k = 1 ; k <= nbsol3 ; k++) {
NbrSol++;
cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
// =======================================================
gp_Dir2d dc1(origin1.XY()-Center.XY());
if (!Qualified1.IsUnqualified()) {
qualifier1(NbrSol) = Qualified1.Qualifier();
}
else if (dc1.Dot(normL1) > 0.0) {
qualifier1(NbrSol) = GccEnt_outside;
}
else { qualifier1(NbrSol) = GccEnt_enclosed; }
qualifier2(NbrSol) = GccEnt_noqualifier;
qualifier3(NbrSol) = GccEnt_noqualifier;
TheSame1(NbrSol) = 0;
gp_Dir2d dc(origin1.XY()-Center.XY());
Standard_Real sign = dc.Dot(gp_Dir2d(-dir1.Y(),dir1.X()));
dc = gp_Dir2d(sign*gp_XY(-dir1.Y(),dir1.X()));
pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dc.XY());
par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
pnttg1sol(NbrSol));
pararg1(NbrSol)=ElCLib::Parameter(L1,pnttg1sol(NbrSol));
TheSame2(NbrSol) = 0;
pnttg2sol(NbrSol) = Point2;
par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
pnttg2sol(NbrSol));
pararg2(NbrSol) = 0.;
TheSame3(NbrSol) = 0;
pnttg3sol(NbrSol) = Point3;
par3sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
pnttg3sol(NbrSol));
pararg3(NbrSol) = 0.;
}
}
}
}
WellDone = Standard_True;
}
}
}
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